Automatic elevator



Dec. 11, 1928. 1,694,823

D. C. LARSON AUTOMAT I C ELEVATOR Filed May 24. 1922 /45 96 /40 06/97 /07 a b o 4/ snow V6.01 4 43 {M @31 mmm 1 5444704044 Patented Dec. 11, 1928.

UNITED STATES PATENT OFFICE.

DAVID C. LARSON, 01E YONKERS, NEW YORK, ASSIGNOR TO OTIS ELEVATOR COMPANY,

OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY,

AUTOMATIC ELEVATOR.

Application filed Kay 24, 1922. Serial No. 563,186.

My invention relates to a push button automatic elevator, more particularly for more than two floors.

It is believed to be desirable to make the following preface, in order that the view point of the invention may be clearly apprehended in the beginning. There are at least two types of electric elevators: one known as a car switch operated elevator which is operated by the operator of the car; and the other a push button automatic elevator which is controlled by the pushing of buttons corresponding to the floors served by the elevator. It is found in service conditions that f the operator is not invariably alert in receiving or obeying signals in his operation of the car, and as a result of his disregard of them he may cause the car to travel a longer mileage and make a larger, number of starts and stops than efliciency of operation allows, thereby reducing the amount of service which the car is capable of rendering and increasing the cost of its operation, consideration of which may cause the architect of a high building to allow for a larger number of elevators for the building than its proper service would require if the elevators were efficiently operated. The increased number of high buildings correspondingly with .a large number of floors has caused careful study to be madeof the possible degree of efliciency attainable, with a view to estimate closely upon the number of elevators actually necessary for given heights of high buildings in order to determine the proper number of elevators, but also to keep down the cost of their operation. The important relation between the number of elevators necessary, based upon the efficiency of their operation and an adequate financial return on the amount of money invested in the building, renders it important that the elevators shall be operated with the highest degree of efliciency attainable. This can only be reached by an elevator which will transport the largest possible number of passengers during peak service at lowest possible cost of transporting them within that period; which means that the utmost elliciency of operation must be secured. The operation of a passenger elevator for the day consists of a series of cycles of starts, runs and stops which the car begins at the ground i'loor, and serves the floors above, and returns n the same manner of service to the ground floor. Such a cycle is, in the regular or schedule operation of the elevator, known as a round trip. An elevator cannot be regarded as an appliance the service of which 1s of indefinite expansion by increasing the speed of the-car. Practical considerations combine to fix a speed limit. The time consumed by the operator in his operation of the car 1s dependent upon his skill and personal equation, such as his alertness in receiving signals and obeying them at the proper time having regard to the direction that the car is moving at the time the signal is received and its position in the hatchway above or below the floor from which the signal was received. The study of the question of elevator efliciency as related to the number of elevators necessary and their cost of operation discloses that the effect of disregarding signals seriously adds to the question, how many elevators shall be installed and materially increases the cost of operating them. It is thought that in the case of high buildings such extra cost and expense may mark the difference between success and failure of the building as a profitable investment. It is accepted by persons skilled in the subject that on account of the cost of operating the elevators without efiicient regard of signals, the amount of rent obtainable for the floors above a certain floor, say those above the thirtieth floor, does not fully meet the cost of their elevator service and leave a profitable return on the capital invested in them. The consequence is that the loss, if met at all, has to be met by the floors below. As the question cannot be successfully met solely by raising the efficiency of design of the elevator or increasing the speed of the car or increasing the efliciency of its operator, it appears that the question can'only be successfully met by operating the elevator automatically in accordance with a predetermined order for its operation. I

At present, push button automatic elevators are only installed in low rise buildings, with comparatively few floors. In the prior art, the button first pushed obtains control of the car both as to the floor at which the first stop will be made and as to the direction of car travel. As a consequence, the car may run past intermediate floors at which other passengers in the car might have been discharged or at which prospective passengers at these intermediate floors, desiring to go in the same direction in which the car is traveling, might have gotten on. In brief, the op eration of the prior art push button elevator for more than two floors is in the respect written about open to the same objection made to the car switch elevator; and therefore, the prior art push button elevator is not capable of increasing the service in a high buildin to solve the problem of how to raise the chiciency of service to such a degree that the elevator shall do its part towards consummating the financial success of the building.

it was perceived however, that if a push button elevator for more than two floors could be designed which would invariably obey signals and in accordance with the most efliciencv of service operation, such an elevator might solve the problem stated above.

It is the object of my invention to produce such a push button elevator for more than two floors which will be invariably operated according to a schedule predetermined upon by its owner, and therefore invariably obey the signals to obtain the most efiicient operation of the elevator as related to service conditions, to the end that the largest degree of efiiciency of which the elevator is capable is attained.

It has also been found that passengers are sometimes relatively late in indicating their Moors or tardy in getting in or out of the car which results in loss of time in the service of the elevator. It is a further object of my invention to avoid as far as eiiicient service will permit the amount of time so lost, by fixing an interval of time during which the car will remain at a floor before it can be operated to leave that floor; and further, to provide automatic means which will restore control of the operation of the car upon the expiration of such interval.

With these objects in view the elevator described and shown herein comprises a combination of the usual electric hoisting motor for the car, and a conventional type of hoist ing and brake apparatus and my present invent-ion, whereby the above stated objects are obtained.

Other objects and advantages will appear from the following description taiten in connection with the accompanying drawing which diagran'nnatically represents an elevator control system embodying my invention.

In the drawing I have shown an A. C. elec tric hoisting motor, M, supply mains a, Z) and c, from which an alternating current is supplied to 'the motor and the controlling mechanisms, an electromagnetic brake B, for the motor, diagrammatically shown, comprising a plurality of magnet coils, electromagneti cally operated reversing switches U and D, controlling the phase relation of current supplied to the motor, electromagnetically operated non-interference switches, E and F, for the reversing switches U and D, respectively, and an electromagnetically operated potential switch P. The elevator further comprises electromagnetically operated floor switches G, H, I, J and K, each comprising two windings and operating two sets of contacts; an electromagnetically operated relay A, with a dash-pot 2i, atlixed thereto to re tard the down or closing movement of the switch; a floor controller comprised of switches each comprising a bridging contact adapted to be moved into and out of engagement with cooperating stationary contacts; and a floor selector controlling device N, illustratively shown in the drawing as comprised of two sets of contacts arranged in rows one above the other, and each set adapted to be engaged electrically by a strip or linger adapted to be moved across the surfaces of the sets of contacts in a direction to the left and right.

The different floor landings from top to bottom are designated L. At the floors, in the order named, are push buttons 1, 2, 3, 4, and 5, for operating the car, C, from the floor, and to each landing door, 0, at each floor landing, is affixed at door lock, (5, represented diagrammatically, comprising a fixed electrical contact 170, adapted to cooperate with another electrical contact 171, at one of the ends of a lever arm, 172, of the lock. The lever arm of the lock is pivoted to the door and carries at its other end a roller, 173. The roller and lever arm nor mally extend out into the hatchway and are adapted to be operated in a manner described hereinafter.

The elevator car, C, in my invention is of the movable platform type. A passengerstepping upon the platform, 7, which constitutes the floor of the car, in entering the car will, due to his weight now on the platform, depress it and open a switch, 8, underneath the car, illustratively shown in the drawing. In using a. car of a movable platform or floor type in my invention, it is necessary, before control of the operation of the car can be gotten, when the car is occupied, that the car gate be first closed. As a resultof the closing of the gate, car, will be closed by the gate and establish a circuit for operating the hoisting motor. whereupon operation of the car can be had from the car. lVhen operating the car from any one of the floor landings it is not necessary that the car gate be closed. \Vhen the car gate is open, the circuit for operating the motor is through the switch 8, underneath a switch, 5), in the the car, there being no weight in the car to open the switch. In the car is a normally closed emergency stop button 10, the purpose of which is to enable a person in the car to stop the car at any point in its travel by pressing the button. If it be desired to hold the car where it is stopped, it is necessary to keep the emergency button pressed, and open the car gate and its switch 9. Merely pressing the button 10 for a moment may stop the car, but will not cause it to remain stopped, for the button will close by its spring, 11, after the pressure that opened it is removed, and the car will resume its travel in the direction it was traveling before the button was pressed. There are push buttons 1, 2, l and 5' in the car for operating it from within. There is also in the car a double throw knife switch, 42, adapted to be in an off orneutral posit-ion or be thrown to on positions, which latter are for up and down directions of travel of the car. lVhen the switch is in its on positions the car will be automatically returned towards the bottom or top floors, as the case may be. For example, when the switch is in up position, the. car will be permitted to return automatically to the top floor from the floor at which it was when last stopped; provided, however, that before the car was stopped at the floorin question, no other buttons were pressed for the floors lower than said last stopped floor; for, if they were pressed, the car, after stopping at the floor in question, will leave that floor for said lower floors, and stop at them before it will return to its direction of travel towards the top floor. The above operation of the car returning automatically to the top floor after its down run, as explained, restores the car to a position to serve the largest number of passengers with the least delay when the occupants of an apartment house are coming down to leave it in the morning. At night when they are returning to their apartments the elevator will serve the largest number of them with the least delay by the car being caused to return automatically towards the first floor after its run in the up direction of travel. This latter manner of operation is obtained byplacing the knife switch 42 in adown position. It is plain that the switch may be thrown for an opposite plan of operation of the elevator; for instance,

in an office building, at which the occupants arrive in the morning and dcpa rt in the afternoon. It is obvious that any other form of switch suitable for the purpose may be used. On the top of the car is a winding, 12, of a stopping switch, 13. affixed to one side of the car, the purpose of which switch is to stop the car at the floor landings. The operation of the switch, 13, is as follows: when the car has reached a position opposite to a predetermined point from the floor landing at which floor it is desired that the car shall be stopped, the winding of the switch is caused to be energized, thereupon pulling a plunger, 14, of the switch within the winding as a result of its energization, and moving an arm, 15, hinged at 16, to an arm, 17, which holds the plunger 14, and a roller 18 afiixed to the arm 15, into the path of a cam, 19, located on a wall of the elevator hatchway and of which cams there is one for each floor landing. The roller 18 in striking the cam 19 in the approach of the car to stop at a landing will be cammed to one side together with the arm 15. The camming of the roller and its arm toward the car will cause another arm, 20, of the stopping switch, and to which the arm 15 is secured to form a lever hinged at 16, to be moved in a direction to the left or away from the car, and break the engagement between an electrical contact 21 upon the arm 20, and another similar contact 22 on the arm 17. The car will stop at the floor landing desired as a result of the disengagement of the contacts 21 and 22. The winding 12 18 now deenergized as will be explained below, releasing its hold upon the plunger 14, which is pulled from out of the winding by a spring 23, secured to the arm 17 and the arm 20, and results in the renewal of the engagement of the contacts 21 and 22 the arms 15, 17, and 20 and the plunger 14; moving under the influence of gravity to move the roller 18 away from engagement with the cam 19. The stopping switch is now in condition to permit the car to be started away from the landing at which it stopped. Also upon the top of the car is mounted the winding 174 of a door locking and unlocking device 175, the winding having av plunger 176, to which is fastened a lever pivoted at 177 near its center, and having its other end connected by a rod 178, to a cam 179, which is movably attached to the car by links 180 and 181, which are pivoted to the car. A small spring, 182, tends to keep the cam in its outward position, such position being normal and is the one shown in the drawing. When the winding 174 becomes energized the plunger 176 will be pulled against the action of the spring 182, thus lifting cam 179, through the lever and the rod 178. lVhile the cam is being lifted by the energized winding, thelinks 180 and 181 will causethe cam to move inwardly toward the side of the car. The cam 179 when in its extended posit-ion is adapted to strike the roller 173, on the lever 172 of the door lock, and unlock the door and break the electrical connection in the lock, interrupting the circuit in which the contacts 170 and 171 are, and in which circuit all the door lock contacts are connected in series.

Describing more fully at this time certain of the elements in the present control system, described only briefly hereinbet'ore, the floor switches, G, H, I, J and K, each coniprise two windings, an upper winding 45 and a lower winding 50, and two sets of contacts, as told hereinbefore. The upper winding 45 of each switch, it being the first of the two windings of each switch to be energized to operate in the operation of starting the elevator, draws up its plunger 46, within itself, freeing a knob 47, afiixed to the plunger, from between the prongs of a spring 48, aflixed to a plunger 49, of the lower winding 50. The plunger 49, and the contact of each set of contacts of the floor switch affixed to the plunger, will drop down; the contacts affixed to the plunger engaging their corresponding stationary contacts. The switch is now closed. To cause the switch to open its contacts, the winding 50 is energized, and when energized draws its plunger 49 within itself, and in doing so breaks the engagement of the contacts aflixed to the plunger from their corresponding stationary contacts. The plunger 46, and its knob 47, have in the meantime dropped down to the position they were before their winding 45 drew them up, so that in the up movement of the plunger 49, the prongs of the spring 48 afiixed thereto will engage the knob 47, on the plunger 46, and hold fast thereto, holding the plunger 49 up and the contacts aiiixed thereto from their corresponding stationary contacts. The fioor controller Q, comprises a plurality of switches, to 34 inclusive, each switch comprising a bridging contact adapted to be moved into and out of engagement with cooperating stationary contacts as told hereinbefore. This controller is geared in the usual way (not shown) to run in unison with the hoisting motor M and operate its contacts in a well-known manner, the switches 26, 28, and 32 acting as a directional means for the circuits to the up-reversing switch U, and the switches 27, 29, 31 and 33, acting as a directional means for the circuits to the downreversing switch D. The switch 25 operates to open the circuit to the winding of the electromagnetic non-interference switch E for the u -reversing switch, at the end of the up trave of theelevator car to allow the switch E to close its contacts, which when closed, establishes a circuit to permit the operation of the car in the down direction. The switch 34'operates to open the circuit to the winding of the electromagnetic non-interference switch F for the down-reversingswitch, at the end of the down travel of the car, to allow the switch F to close its contacts,

. which when closed, closes a circuit to permit the operation of the car in the up direction of travel. The floor selector device N, illustrat-ively shown in the drawing, is geared to run in unison with the hoisting motor M, by a chain and sprocket connection 35, fastened to a shaft 36, of the motor and a shaft 37, of the controlling device. Upon the shaft 37 is formed a screw 38, which holds a traveling contact finger holder 39 adapted to be moved to the left or right by the turning of the screw 38, when the shaft is turned through the intermediation of the chain and sprocket connection 35, by an operation of the hoisting motor M. To the upper side of the finger holder 39 are secured contact fingers 40 and 41, which slide along the surfaceot the two sets of contacts in the traveling movement of the finger holder 39. The contact of each set with which the contact fingers 40 and 41 are adapted to become engaged upon a stop of the car corresponds to the floor at which the car is stopped, and also to the push button which was operated to cause the car to travel to that floor. To the under side of the contact finger 39 is held a strip 43, which is adapted to slide in and be guided by a slot, not shown, in a track 44, underneath the controlling device. The strip 43 in the slot in the track holding the contact finger 39, upright, and causing it to move on the screw in its turning movement.

The eperation of the elevator system as a whole will now be described. lVith the parts as illustrated in the drawing, the car is at rest, level with the third floor landing. Let it be assumed that it is desired to bring the car to the fourth floor landing by operating the push button 4 on that .fioor, which will cau e the car to ascend to that floor and stop thereat. The pressing of the push button 4 closed first a circuit for the winding 45 of the electromagnetic floor switch J as follows: from supply main (1, by wire 51, junction point 52, by wire 53, junction point 54, by wire 55, push button 4, by wire 56, through the winding 45, of the floor switch J, by wire 57,,junct-ion point 58, by wire 59, junction point 60, by wire 61, junction point 62, by wire 63, junction point 64, by wire 65, to supply main 7;. The winding 45 of the floor switch J has therefore been energized and the switch J is caused to be closed as told hereinbefore. The winding 45 is energized :tor a moment only, that is while the push button 4 is pressed. The closing of the switch J completed by its contacts, 68 and 69, a circuit for the winding 70 of the tip-reversing switch U, as follows: from supply main (2, by wire 51, junction point 52, by wire 71. junction point 72, by wire 73, contact 74, of the floor switch G, by wire 75, junction point 76, by wire 77, junction point 78, by wire 79. through the now closed contacts, 68 and 69, of the floor switch J, by wire 80. through the closed floor controller switch 28, by wire 81. junction point 82, by 'wire 83, junction point 84, by wire 85, through the closed contacts 86, of the non-interference switch F for the down-reversing switch, by wire 87, junction point 88, by wire 89, through the winding 70 of the lip-reversing switch U, junction point 90, by wire 91, through the closed contacts 92 of the relay switch A, by wire 93, through the closed contacts 21 and 22 of the stopping switch 13, by wire 94, junction point 95, by wire 96, contact 97, of the down-reversing switch, and b wire 98, to the supply main Z). The winding of the up-reversing switch is, therefore, energized and the reversing switch closed. The closin of the floor switch J also completed by its contacts 68 and 69 a circuit for the winding 99 of the non-interference switch E of the up-reversing switch, as follows: starting at the junction point 88,-as up to that point the circuit is the same as traced for operatin the winding 70 of the up-reversing switc through the winding 99 of the non-interference switch E, by wire 100, through the closed floor controller switch 25, by wire 101, junction point 102, by Wire 103, junction point 104, by wire 105, junction point 60, by wire 61, junction point 62, by wire 63, junction point 64, to the supply main Z), by wire 65. The winding 99 of the non-interference switch E is therefore energized and its contacts 106 are separated. The switch E by the separation of its contacts 106 opened the circuit to the winding of the down-reversing switch and the winding of the non-interference switch F. As the contacts of the non-interference switch E "are adapted to be kept in an open position until the. car has completed its travel in the up direction in response to the button pushed, the keeping open of the contactsof the noninterference switch E prevents the ascending car from being reversed until it has completed its run in the up direction. The up reversing switch was operated as told before, and closed its contacts 107 and 108 thereupon a circuit is established to the winding 174 of the door locking and unlocking device 175 as follows: from supply main 0, by wire 110, contact 111, of potential switch P, by wire 112, junction point 113, by wire 114, junction point 115, by wire 129, junction point 183, by wire 184, through the winding 174 of the unlocking device 175, by wire 185, unction point 186, by wire 121, contact 122, of the downreversing switch, by wire 123, junction point 124, by wire 125, through the closed contacts, 108 and 107, of the up-reversingswitch, by wire 126, contact 97, of the downreversing switch, by wire 98, to the supply main 6. The winding 174 ,of the locking and unlocking device 175 is therefore energized and will pull its plunger 176 within itself, which movement pulls the cam 179 of the device towards the car as told hereinbefore. The roller 173 on the lever arm 172 of the door lock 6 now being free of the cam 179 and the door being closed, the lever and roller will swing down, locking the door, and closing the contacts 170 and 171 in the lock. lVith the contacts 170 and 171 closed and the contacts 107 and 108 of the up-reversing switch closed, a circuit is established for operating the winding 109, of the potential switch-P, as follows: from supply main 0, by wire 110, contact 111,

of switch P, by wire 112, junction point 113,

by wire 114, junction point 115, through the winding 109, of switch P, by wire 116,

son or other kind of weight on the platform of the car. But in the event that there is a weight on the platform which causes the switch 8 to open, the circuit would be by wire 118, through the car gate switch 9, closed by the closed car gate, as told hereinbefore, by wire 119, one of the contacts of the switch 8, by wire 120, through the door contacts 170, 171, on the. doors of all the fioor landings, as all the doors are closed and locked, junction point 186, by wire 121, contact 122, of the down-reversing switch, by wire 123, junction point 124, by wire 125, through the closed contacts 108 and 107 of the up-reversing switch, by wire 126, contact 97 of the downreversing switch, by wire 98 to the supply main 5. The winding 109 of the potential switch P is therefore energized and the switch caused to be .closed. The switch in closing, opened its contacts 127, to which condition there is no importance attached at this time other than that they are open. The closed contacts 107 and 108 of the reversing switch also established a circuit for the winding 128 of the relay switch A, as follows: from junction point 115, by wire 129, through the winding 128, by wire 130, and junction point 124,- to and through the closed contacts 108 and 107, tothe supply -main 6, as before traced. The winding 128 of the switch A is therefore energized and the switch caused to beopened. The opening of the contacts 92 of the switch A served to insert a resistance 13]. in the common circuit to the windings of both reversing switches. In the present operation of the elevator the resistance is inserted in the circuit of the winding 70 of the reversing switch U. The function of the resistance 131 at this time is-to cut down the current in the circuit of the winding 70 of the reversing switch after the switch has been closed, as the amount of current obtained in the circuit to close the reversing switch is more than is required to hold it closed. Also by virtue of the operation of the relay switch A at this time for the purpose as has been set forth, the switch is in a condition to function in another capacity as well as will be hereinafter seen. \Vith both the reversing switch U and the potential switch P closed, circuits to the hoisting motor H for opcratingto'lift the car are ob tained. The coil for the brake B at the same time receives current through wires 132, 133 and 134, and operates to lift the brake shoe. The circuits to the hoisting motor M, through the closed contacts of the reversing switch U and the potential switch P, are as follows: from supply main a, through the closed contacts 135 and 136 of the potential switch P, by wire 137, through the closed contacts 138 and 139 of the reversing switch U, by wire 140, junction point 141, by wire 142, through a stator winding of the hoisting motor M, by wire 143, junction point 95, by wire 96, contact 97 of the down-reversing switch, and wire 98 to the supply main 5. The remaining circuit to the hoisting motor M for operating it, is from the supply main 0, by wire 110, through the closed contacts 111 and 144, of the potential switch, by wire 145, through the contacts 146 and 147 of the reversing switch U, by wire 148, unction point 149, by wire 150, through a stator winding of the hoisting motor M, and to the supply main Z), by wire 143, as traced above.

Upon the car approaching the desired fourth floor landing and to stop thereat at this time, it will be assumed that the car has reached a predetermined point in its approach to the floor. The contact fingers 'and 41 of the selector controlling device N will be contacting with contacts 151 and 152, respectively, when the assumed predetermined point is reached. Of the engagement of the finger 40 with the contact 151 at this time, there is no special significance attached other than that they are engaged with each other. The engagement of the finger 41 with the contact 152 closed a circuit for the winding 12, on top of the car, of the stopping switch 13, as follows: from supply mam a, by wire 51, junction point 52, by wire 53, junction point 54, by wire 153, junction point 154, by wire 155, through the winding 12, of the stopping switch 13, by wire 1 56, contact 157 of the floor magnet switch K, by Wire 158, junction point 159, by wire 160, through the closed contacts 161 and 162, of the floor switch J, by wire 163, contact 152, finger 41, by wire 164, junction point 64, by wire 65, to the supply main 7). The winding 12 of the stopping switch 13 is therefore energized-and pulls into itself the plunger 14 of the switch. The movement of the plunger moves the arm 15 and the roller 18 attached thereto away from the car to a position to enable the roller 18 to strike the hatchway cam 19 for the fourth floor landing, which engagement of 'the roller and cam opens the contacts 21 and and closes its other contacts 127. At the same time the winding 17 4 on top of the car of the device 175 is deenergized, causing the cam 179 of the device to be thrust outwardly. The cam 179 upon engaging the roller 173 on the lever arm 172 of the door lock, will force the roller and lever up, thereby opening the contacts 17 0 and 171 in the door lock, and serving to unlock the door, which can now be opened. l/Vhen the contacts 170 and 171 are open, the car can not be moved, because when they are open they serve to keep open the circuit to the potential switch, and which latter must be closed in order to start the hoisting motor M. Of course, the same is also true if and when the door is open. The potential switch was originally deenergized by the opening of the contacts 107 and 108 of the reversing switch U, and which contacts in opening also deenergized the winding 174 of the door locking and unlocking device 175.

The opening of the contacts 170 and 171 in the door lock, which are in the circuit to the winding of the potential switch, is the means for preventing the potential switch from being closed to enable the hoisting motor to start until the contacts of the lock have been again closed, and which are closed by the cam 179, of the device 175 retiring against the side of the car as told hercinbefore. With the car now stopped at the desired fourth floor landing and the landing door open, if a push button be pushed in the desire to start the car, it will cause a circuit to be closed to the winding of a reversing switch, Whereupon the winding will become energized, and serve to close the contacts of the reversing switch, which will serve to make a circuit to the otential'switch and to the winding 174 of t e device 175, which will cause the cam 179 of the latter to retire against the side of the car out of the way of the roller 17 3; but the car will not start, because the door con- 'tacts 170 and 171 are open, as stated above.

But with the parts in the condition last mentioned, and the landing door closed, its closure will serve to close the door contacts 17 O and 171 with each other; and through those closed contacts a circuit is completed to the potential switch, and the latter in turn closes a circuit to the hoisting motor. Returning to the statement above that the opening of the circuit to the winding 109 of the potenopened the circuit to the winding 12 of t 41 of the selector controlling device N, by wire 164, junction point 64;, and by wire 65, to the supply main 1). The winding 50 of the floor switch is thereby energized and the switch J opened in the manner described hereinbefore. The contacts 68 and 69 of the floor switch J are in the circuit to the winding 70 of the rip-reversing switch, and are the means for closing the circuit to the winding 70 for operating the up-reversing switch for startmg The contacts (58 and 69 are now open, but there is no special significance attached to their being open, as the circuit to the winding 70 of the up-reversing switch, in which the contacts68 and 69 are, had already been opened in the operation of stopping the car by the opening of the contacts 21 and 22 of the stopping switch 13. The floor switch J by the opening of its contacts 161 and 162 stopping switch 1.3, and consequently the plunger 14 is now pulled from out of the winding 12 by the spring 23, which also brings the contact 22 on the arm 17, to which the plunger is atlixed, into engagement with the contact 21 on the arm 20, the arms 15, 17 and 20 and plunger 14 moving under the infiuence of gravity to move the roller away from engagement with the cam 19.

The landing door at the floor at which the car was stopped was closed at the time the car stopped, but was opened after the car stopped; if now the door be again closed, the car can be operated by pressing a push button either in the car or atpafloor landing. If, after a button is pushed with the intention to cause the car to start from a landing for a floor corresponding to the button pushed, but subsequent to the pushing of that button or before or after the car has started in response thereto or during its operation in moving towards that floor, and either the same button or any one or all of the other buttons be pushed, nevertheless the button first pushed will establish the direction the car will travel towards the landing corresponding to tl re button which was first pressed; if, however, one or more of the buttons subsequently pushed are for a floor or floors intermediate of the floor from which the car is started and the floor corresponding to the button first pushed,'the car will stop at the intermediate floor or floors; and after stopping thereat, will resume its travel towards the floor of the button originally first pushed; and stop thereat. It may be well to observe of that operation of the elevator that the car will respond as to direction of its travel to the button originally first pushed, but as to its stopping to the natural order of the floors for the direction of travel determined by the said first button. To apply the'observation to the apparatus of the elevator, the floor switch corresponding to the button originally the elevator as hereinbefore related.

pressed closes by one of its sets of contacts a circuit tothe winding of the non-interference switch for a reversing switch corresponding to that button as to the direction of travel of the car, and maintains the non-interference switch operated for that direction of car travel until all the push buttons pressed calling for a travel of the car in thatdirection of travel have been served. The Lip-reversing switch upon opening serves to separate also its contacts 107 and 108 which opens the circuit to the winding 109 of the potential switch, causing that switch to open as hereinbet'ore told; the opening of thecontacts 107 and 108 of the reversing switch further serves to open the circuit to the winding 128 of the relay switch A, and cause the latter to close its contacts 92. The closing movement of the switch A is retarded by its dash-pot 24 as told hereinbefore; the purpose of the retardation is to prevent the switch A closing until a predetermined time has elapsed, say for instance,- -five (5) seconds. \Vhile the contacts 92 of the relay switch are open, the resistance 131 is in the circuit to the reversing switches, and serves at that time to prevent either switch from closing. lVhen, 'however, after either reversing switch is closed and the resistance 131 inserted, the closed reversing switch will remain closed and the other switch will necessarily remain open, all of which has been told hereinbefore. Let it be assumed that a button in the car has been pushed to cause the elevator apparatus to operate to bring the car to the landing corresponding to the button pushed, and that the car has stopped thereat; immediately thereupon the relay switch A is operated to cause its contacts 92 to close upon the expiration of the predetermined time limit; as a consequence,- the car will he held at the. landing during that time or period; and this is also true regardless of whether or not any one or all of the buttons either in the car or on the floor landings were pushed during the time the car was traveling to the landing or during the running of the predetermined time, and whether or not the door of the carer landing floors be left closed or be opened at the landing at which the car is stopped. Should the car door be left closed during the prescribed time, and within that time a button be pushed in the desire to cause the car to travel from that floor to the fioor corresponding to the push utton pressed, the elevator will not start ho ever until after the time limit has expired. The same is true if the car door be opened and then closed within the time limit. What has been said in relation to the pushing of a button in the car as to not opening the doors of the car and landing floor or opening and closing them within the prescribed time, is true also as to the operation of the elevator by the buttons on the floor landings when the landing. door is either open or kept closed lit) landing omit or fail to use the car within the time limit after they have called it to that landing where they are; the use of the car carrying with it the implication that they have opened the landing and car doors, en-

tered the car, and closed the doors behind them. After the time limit has expired, and the landing and car doors are closed, and then a button be pushed for another floor, the car will start away from the landing towards the landing corresponding to the button pushed. \Vhere buttons for different floors have been pushed, the car will be first operated in the direction towards the floor corresponding to the button first pushed, and stop thereat first in case that floor is next to the floor last stopped at; and the other floors in that direcion in succession. In the event that some of the other buttons pushed were for floors in the opposite direction from the car than the floor for the first button pushed, the car is automatically reversed, after its last stop in the first direction, to proceed to the floors in said opposite direction corre sponding to those buttons pushed.

I wish it to be understood that my invention is not limited to the mere details, construction or arrangement of parts disclosed, for it is plain that various modifications might be made within the spirit and scope of the invention. Furthermore, I have for the sake of illustration shown a three phase system of alternating current, but my invention is not confined to any particular number of phases and, moreover, may be used if desired with a direct current system of circuits as is obvious.

WVhat I claim and desire to secure by Letters Patent of the United States is:

1. A control system for an elevatoricar comprising; a plurality of controls, onefor each of a plurality of floors; and car actuating and stopping mechanism responsive to said controls that are operated for causing the stopping of the car at the floors corresponding to the controls operated, in the natural order of floors, regardless of the order in which said controls are operated, and responsive 'to said controls that are operated for causing the starting of the car after each .stop, regardless of when said controls are operated.

2. An elevator system comprising; an elevator car; a plurality of floors; a plurality of manually operable switches, one for each of said floors; means responsive to the operation' of any one of said switches, other than the one for the floor at which the car is positioned, for causing the starting of the car and thereafter responsive to all of said switches operated tor causing the restarting of the car after each stop until stops have been made in response to all of the switches operated; and means responsive to said operated switches for causing the stopping of the car at the floors corresponding to the switches operated, in the natural order of floors, regardless of the order in which the switches are operated and regardless of when the operation of. said operated switches occurred.

3. An elevator system comprising; an elevator car; a plurality of floors; a plurality of push buttons, one for each of said floors; means responsive to the operation of any one of said buttons, other than the one for the floor at which the car is positioned, for

causing the starting of the car and thereafter responsive to all of said lJlltipllS operated for causing the restarting of the car after each stop until stops have been made in response to all of the buttons operated, thus giving continuous operation until all of said buttons have been answered; and means responsive to said operated buttons for causing the stopping of the car at all the floors for which buttons have been operated,

regardless of the time during said continu-.

ous operation of the car that the operation of said buttons occurred, said stopping means including means for causing said stops to be in thenatural order of floors, regardless of the order in which the buttons were operated.

4. An elevator system comprising; an elevator car; a plurality of floors; a series of push buttons in the car, one for each of said floors, arranged for operation by passengers in the car; a push button in the hall at each of said floors arranged for operation by intending passengers; means responsive to the operation of one or more of said push buttons, other than those for the floor at which the car is positioned, regardless of whether i car or hall button, for causing the starting of the car and thereafter responsive to all of said car buttons and hall buttons operated for causing the restarting of the car after each stop until stops have been made at all floors for which buttons have been operated, thus giving continuous operation until all of said buttons have been answered; and

'means responsive to said operated buttons for causing the stopping of the car at all the floors for which car buttons have been open ated and at all floors at which hall buttons have been'operated, regardless of the time during said continuous operation of the car that the operation of said buttons occurred, said stopping means including means for causing said stops to be in the natural order of floors, irrespective of the sequence in which the buttons are operated.

5. A control system for an elevator car comprising; a plurality of switches in the car,

one for each of a plurality of floors; a plurality of additional switches, one located at each of said floors; and car actuating and stopping mechanism responsive both to the switches in the car and the switches at the floors that are operated for causing the stopping of the car at the floors corresponding to the switches operated, in the natural order of said floors, regardless of the order in which said switches are operated, and responsive to said switches in the car and at the landings that are operated for causing the starting of the car after each stop, regardless of when the operation of said switches occurred.

6. A control system for an elevator car comprising; a plurality of start and stop switches, each for a different floor; mechanism responsive to said switches that are operated for causing the stopping of the car at the floors corresponding thereto, in the natural. order of floors, regardless of the order in which said switches are operated; and mechanism responsive to said switches that are operated for causing the starting of the car after each of said stops, regardless of when said operation of each of said operated switches occurred.

7. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors; means responsive to each of said switches that is operated for causing the stopping of the car at the floor corresponding thereto; floor selector mechanism for causing the order of said stops to be in the natural order of the floors corresponding to the switches operated, regardless of the order in which said switches are operated; and means responsive to said switches that are operated for causing the starting of the car after each of said stops until it has stopped at all the floors corresponding to the switches operated, regardless of'when said operation of said operated switches occurred.

8. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors, each of said switches being adapted, when operated, to remain in operated position until reset; car actuating and stopping mechanism responsive to the switches that are in operated position to cause the stop ing of the car at the floors'corresponding tiereto, in the natural order of said floors, regardless of the order in which said switches are operated, and responsive to said switches in operated position to cause the starting of the car after each of said stops; and means for causing the resetting of each of said operated switches.

9. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors, each of said switches being adapted, when operated, to remain in operated position until reset; car actuating and stopping mechanism responsive to the switches that are in operated position to cause the stopping of the car at the floors corresponding thereto, in the natural order of said floors, regardless of the order in which said switches are operated, and responsive to said switches in operated position to cause the starting of the car after each of said stops; and means responsive to the stopping of the car at each of said floors for causing the resetting of the switch corresponding thereto.

10. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors, each of said switches being adapted, when operated, to remain in operated position and being adapted, when in operated position, to control both the starting and the stopping of the car; starting means responsive to the operation of any one of said switches, other than the one for the floor at which the car is positioned and provided that no other of said switches is in operated position, for causing the starting of the car and thereafter responsive to all of the operated of said switches that remain in operated position after each stop for causing the starting of the car after said stop; stopping means responsive to all of the operated of said switches for causing the stopping of the car at the floors corresponding to said operated switches, in the natural order of floors, regardless of the order in which the switches are operated; and means for causing the resetting of each of said operated switches upon the stopping of the car at the floor corresponding thereto.

11. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors, each of said switches being adapted, when operated, to remain in operated position and being adapted, when in operated position, to control both the starting and the stopping of the car; starting means responsive to the operation of anyone of said switches, other than the one for the floor at which the car is positioned and provided that no other of said switches is in operated position, for causing the starting of the car andthereafter responsive to all of the operated of said switches that remain in operated position after each stop for causing the starting of comprising; a plurality of floor relays,ione for each of a plurality of floors, each of said relays being adapted, when operated, to remain in operated posit-ion until reset; a plurality of push button switches, one for each of said relays, each push button switch, upon being operated, causing the operation of its floor relay; ear actuating and stopping mechanism responsive to the relays that are in operated position to cause the stopping of the car at the floors corresponding thereto, in the natural order of said floors, regardless of the order in which said relays are operated, and responsive to said relays in operated position to cause the startingvot the car after each of said stops; and means responsive to the stopping of the car at each of said floors for causing the resetting of the relay corresponding thereto.

13. A control system for an elevator car comprising; a plurality of floor relays, one for each or a plurality of floors, each of said relays being adapted, when operated, to remain in operated position until reset; a plurality of push button switches, one for each of said relays, each push button switch, upon being operated, causing the operation of its floor relay; car actuating and stopping mechanism responsive to each of said relays that is in operated position to cause the stopping of the car at the floor corresponding thereto and responsive to said relays in operated position to cause the starting of the car after each of said stops until it has stopped at all the floors corresponding to the relays operated, said mechanism including floor selecting mechanism for causing the order of said stops to be in the natural order of floors, regardless of the order in which said relays are operated; and means cooperating with said floor selector mechanism for causing the resetting of each relay upon the stopping of the car at the floor corresponding thereto.

14. A control system for an elevator car comprising; a plurality of push button switches within the car, one for each of 9. p111- rality of floors; a plurality of additional push button switches, one at each of said floors; a plurality of floor relays, one for each of said floors, each of said relays being operated in response to the operation of.

either the push button switch in the car for the floor corresponding thereto or the push button switch at the floor corresponding thereto and being adapted when operated to remain in operated position until reset; car actuating and stopping mechanism respon sive to the relays that are in operated position for causing the stopping of the car at the floors corresponding thereto, in the natural order of said floors, regardless of the order in which said relays are operated,- and responsive to said relays in operated position to cause the starting of the car after each of said stops; and means for causing the resetting of each of said relays.

15. A control system for an elevator car comprising; car actuating and stopping mechanism; a plurality of switches, one for each of a plurality of floors; means responsive to the first of said switches operated for causing thcpperation of said mechanism to start the car; means responsive to all of said switches operated for causing the operation of said mechanism to stop the car at the floors corresponding to the switches operated, regardless of the time of operation of the subsequently operated switches; and automatic means for causing the operation of said mechanism to start the car after each stop so long as switches which have been operated remain unresponded to.

16. A control system for an elevator car comprising; car actuating and stopping mechanism; a plurality of manually operable switches, one for each of a plurality of floors; means responsive to the operation of any one of said switches, other than the one for the floor at which the car is positioned, for causing the operation of said mechanism to start the car; means responsive to all of said switches that are operated for causing the operation of said mechanism to stop the car at the floors corresponding to the switchesoperated until all of such operated switches have been responded to, regardless of the time of operation of such operated switches; and automatic means for causing the operation of said mechanism to restart the car after each stop so long as switches which have been operated remain unresponded to.

17 An elevator system comprising; an elevator car; a plurality of floors; a series of push buttons, one for each of said floors: means responsive to the pressing of any one of said buttons, other than the one for the floor at which the car is positioned, for causing the starting of the car; and means responsive to all of the push buttons which are pressed for causingthe stopping of the car at the floors corresponding to thebuttons pressed until all of such pressed buttons have been responded to, regardless of when the pressing of such pressed buttons occurred, said starting means being responsive after each stop to the pressed buttons to which said stopping means has not responded for causing the restarting of the car.

18. An elevator system comprising; an elevator car; a plurality of floors; a plurality of push buttons, one for each of said floors; means responsive to the operation of any one of said buttons, other than the one for the floor at which the car is positioned, for caus- 'ing the starting of the car and thereafter responsive to all of said buttons-operated for causing the restarting of the car after each stop until stops have been made in response to all of the buttons operated, thus giving continuous operation until all of said buttons have been answered; and means responsive to said operated buttons for causing the stopping of the car at all the floors for which buttons have been operated, regardless of the time during said continuous operation ofthe car that the operation of said buttons occurred.

19. An elevator system Comprising; an elevator car; a plurality of floors; a series of push buttons in the car, one for each of said floors, arranged for operation by passengers in the car; a push button in the hall at each of said floors arranged for operation by intending passengers; means responsive to the operation of one or more of said push buttons, other than those for the floor at which the car ispositioned, regardless of whet-her car or hall button, for causing the starting of the car andthereafter responsive to all otsaid car buttons and hall buttons. operated for causing the restarting of the car after each stop until stops have been made at all floors for which buttons have been operated; and means responsive to said operated buttons for causing the car to be stopped at all floors for which car buttons have been operated and at all floors for'which hall buttons have been operated, regardless of when the operation of such buttons occurred.

20. An elevator system comprisng; an elevator car; a plurality of floors; a series of push buttons, one for. each of said floors;

means responsive to any number of said buttons, including all thosebiit the one for the floor at which the caris positioned, operated while the car is at said fioor, regardlesslof the floor at which the car is positioned, forcausing the starting of the car from such floor and thereafter for causing the restarting of the car after each stop until stops have been made in response to all of said operated buttons;

means responsive to said operated buttons for causing the stopping of the car at the floors corresponding to said operated buttons; and means for causing the stops in response to said operated buttonsfor floors in the direction in which the car started from said floor at which. it was positioned to be made before those in response to said operated buttons for floors in the opposite direction from'such floor are made,regardless of the order in which said operated buttons were operated.

21. An elevator system comprising; an elevator car; a plurality of floors; a push button for each of said floors; means responsive to the operation of any one of said buttons, other than the one for the floor at which the car is positioned and provided no other of said buttons is operated, for causing the starting of the car toward the floor corresponding to the button operated and thereafter responsive to all of the buttons operated for causing the restarting of the car after each stop until stops have been made in response to all of the buttons operated; means responsive to the buttons operated for causing the stopping of the car at the floors corresponding to the buttons operated, even though buttons are operated for floors in a direction from the car opposite to that in which the car is traveling; and means for causing the stops in response to operated buttons for floors toward which the car is moving to be made before the stops in response to the other operated buttons are made, regardless of the order in which the buttons. are operated.

22. An elevator system comprising; an elevator car; a plurality of floors; a push button for each of said floors; means responsive to the operation of any one of said buttons, other than the one for the floor at which the car is positioned andprovided no other of said buttons is operated, for causing the starting of the car toward the floor corresponding to the button operated and thereafter responsive to all of the buttons operated for causing the restarting of the car after each stop until'stops have beenmade in response to all of the buttons operated; means responsive to the buttons operated forcausing the stopping of the car at the floors cor responding to the buttons operated, even though one or more buttons are operated at a time when the car is traveling away from the floors for which such buttons are provided; and means for causing the stop in re-' sponse to each button for a floor toward whichfthe car is traveling which was operated prior to the arrival of the car within a predetermined distance of such floor to be made before the stops in res onse to the other operated buttons are ma e, regardless of the order in which the buttons are operated.

23. An elevator system comprising; an elevator car; a plurality of floors; a push button for each of said floors; means responsive to the operation of any one of said buttons, other than the one for the floor at which the car is positioned and provided no other of said buttons is operated, for causing the starting of the car toward the floor corresponding to the button operated and thereafter responsive to all of the buttons operated for causing the restarting of the car after each stop until stops have been made in response to all of the buttons operated; means responsive to the buttons operated for causing the stopping of the car at the floors corresponding to the buttons operated, even though one or more buttons are operated at a time when the car is traveling away from the floors for which such buttons are provided; and means for causing the stops to "be in the natural order of floors for the direction'in whichvthe car is traveling, regardless of the order in which the buttons are operated.

24. A control system for an elevator car comprising; a switch; and means responsive to the operation of said switch for causing the car, when traveling in one direction, to stop at a floor, so long as said switch was operated before the ear arrived within a predetermined distance of said floor, and for causing the car to travel in the other direction, after a stop in said one direction, and to stop at said floor when said switch was operated after the car arrived within said predetermined distance of said floor when traveling in said one direction, regardless of the time, after the car arrived within said predetermined distance of said floor, that said switch was operated.

25. A. control system for an elevator car comprising; a plurality oi switches, one for each of a plurality of floors; and means responsive to the operation of said switches, firstly, for causing the car, when traveling in one direction, to stop at the floors corresponding to the switches operated, so long as each of the operated switches was operated before the car arrived within a predetermined distance of the floor corresponding to the switch operated, and, secondly, for causing the car to travel in the other direction, after its last stop in said one direction, and to stop at each floor corresponding to each switch operated after the car arrived within said predetermined distance of said each floor when traveling in said one direction.

26. An elevator system comprising; an elevator car; a plurality of floors; a plurality or" manually operable switches, one for each of said floors; and means res onsive to the operation of said switches, rstly, for causing the starting of the car from any floor at which it may bepositioned toward the floor corresponding to the first of said switches operated, secondly. for causing the car, when traveling in said direction, to be st'oppedfat the floors in that direction corresponding to the switches operated, provided each of said switches for such floors is operated in sufiicient advance of the arrival of the car at the floor for which such switch is provided to permit the stop to be made, and, thirdly, for causing the car to travel in the other direction, after its last stop in the first direction, and to stop at the floors corresponding to the switches operated too late to effect a stop, when the car was traveling in the first direction, provided such operation of said switches occurred.

27. An elevator system comprising; an elevator car; a plurality of floors; a plurality of push buttons, one for each of said floors and means responsive to the operation of said push buttons, firstly, for causing the car, when traveling in one direction, to stop at the floors corresponding to the buttons operated, in the natural order of floors, re-

gardless of the order in which the buttons are operated, provided each of such buttons is operated in sufiicient advance of the arrival of the car at the floor for which the button is provided to permit the stop to be made, and, secondly, in the event that buttons were operated too late to ettect the stopping of the car while traveling in said one direction, for causing the car to travel in the opposite direction, after its last stop in said one direction, and to stop at the floors correspond ing to said late operated buttons, in the natural order of floors, regardless of the order of operation of said late operated buttons.

28. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors; means responsive to the operation of. any one of said switches, provided no other of said switches is operated, for causing the car to move in a direction toward the floor corresponding to said one switch operated; means said switches for floors in the other direction from the car when these second specified switches are operated for causing the car to travel in said other direction, after its last stop in the first specified direction, and to stop at the floors corresponding to said second specified switches operated.

29. A control system for an elevator car comprising; a plurality of switches, one for each of a plurality of floors; means responsive to the operationot any one of said switches, provided no other of said switches is operated, for causing the ear to move in a direction toward the floor corresponding to said one switch operated; means responsive to the operation of said one switch and to the operation of other of said switches for floors in said direction from said car when said other switches are operated for cans ing the car to stop at the floors corresponding to these specified switches operated, in the natural order of fioors, regardless of the order in which said specified switches are operated; and means responsive to the operation of said switches for floors in the other direction from the car when these second specified switches are operated for causing the car to travel in said other direction, after its last stop in the first specified direction, and to stop at the floors corresponding to said second specified switches operated, in the natural order of floors, regardless of the order in which said second specified switches are operated.

30. An electric elevator system comprislOO ing; a plurality of switches, one for eachof a plurality of landings, each switch being operable to cause the starting of the car; a plurality of hatchway cams, one for each oi said landings; slow-down and stop switch mechanism carried by the car, said mechanism comprising switch members and an operating member for cooperating when extended with said cams to cause the operation of the switch members to efi'ect the slowing down and stopping of the car at the landings; and a floor selector device for causing the extension of said operatin member for cooperation with the cam For the landing corresponding to each switch operated to slow down and stop the car at said landing.

31. In an automatic elevator for more than two floors, the combination of a car stopping switclnliaving a coil, an arm adapted to be moved by the coil into the hatchway, a cam adapted to move the arm to open the switch, and a floor controlling selector comprising means operable by the movement of the elevator for establishing a circuit to the coil.

32. In a push button automatic elevator for more than two fl0ors,-the combination of a car stopping switch, having an arm, a cam to strike the arm, a coil to move the arm to ,enable the cam to strike it, a floor selector adapted to be moved by the movement of the elevator and establish a circuit to the coil, and means to withdraw the arm from the cam and close the switch. y

33. A control system for an elevator car comprising, a plurality of control means, one for each-floor, means for causing the car to stop at the floors for which control means are operated and for causing the car to continue in operation after each stop so as to respond to all the control means operated, means for causing the car finally to return to a selected floor after all control means operated have been responded to, and means for changing the floor selected;

34. A control system for an elevator ca comprising, control means for each floor,

means responsive to the operation of said control means for causing the car to stop at the floors for which the control means are operated, and means for causing the car finally to stop at a. selectedfioor after all control means have been. responded to, said' last named means comprisin a plural position switch, the floor selected eing dependent on the position of' s a id switch.

35. An elevator system comprising; an elevator car; a plurality of floors; a plurality of push buttons, one for each of said floors; means responsive to the operation of said push buttons for-causing the car to stop at tho floors corresponding to the buttons operated; a manually operable switch having an on position and an ofi' position; and means for automatically causing the car to return to a selected one of said floors after all of said buttons have been responded to, under conditions where said manually operable switch is in on position, and for causing the car to remain at the floor at which it last stops in response'to a push button, under conditions where said manually operable switch is in oif position.

36. An elevator system comprising; an elevator car; a plurality of floors; a plurality of push buttons, one for each of said fioors; means responsive to the operation of said push buttons for causing the car to stop at the floors corresponding to the buttons operated; a switch having two operative positions and a neutral position; and means for automatically causing the car to return to a selected one of said floors after all of said buttons have been responded to, under conditions where said switch is inan operative position, the floor selected being dependent on the operative'position of said switch, and for causing the car to remain at the floor at which it last stops in response to a push button until another button is operated, under conditions where said switch is in neutral position.

37 A control system for an elevator car comprising, a plurality of switches, one for each floor, means responsive to the operation of said switches for causing the car to stop at the floors corresponding to the switches operated, and means for automatically causing the car to return to a selected terminal floor after all of said switches have been responded to, said last named means comprising a switch having-two operative positions, the terminal floor selected being dependent on the operative position of said switch.

38. A control system foran elevator car comprising, a plurality'of control means, one

for each of a plurality of floors, means responsive to the, control means operated for causing the car to stop at the floors, for which control means are operated, in the natural order of .fioors, regardless of the order in which the control means have been operated, and automatic means for causing the car to stop at another floor in its-natural order with respect to the first named floors.

39. A control system for an elevator car comprising, a plurality of switches, one for each of a plurality of floors, and means for in to the switches operated, in the natural order of floors, though said switches are 0perated out of said order, and for causing it to stop at a selected one of said floors in its natural order, regardless of whether the switch for said selected floor has been operated, and means for causing the automatic starting of the car after each stop except a stop atsaid selected floor with all operated switches responded to. 1

In testimony whereof, I have signed my name to this specification.

DAVID C. LARSON. 

